Broadband Millimeter-Wave Dielectric Properties of Liquid Crystal Polymer Materials

Liquid crystal polymers (LCPs) are a class of thermoplastic polymers widely used for packaging radio frequency (RF), microwave, and low millimeter (mm)-wave integrated circuits operating at frequencies as high as 77 GHz. Because of their relatively low cost and attractive electrical, thermal, and me...

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Bibliographic Details
Published in:IEEE transactions on components, packaging, and manufacturing technology (2011) packaging, and manufacturing technology (2011), 2022-01, Vol.12 (1), p.192-194
Main Authors: Mcgarry, Michael P., Iyer, Mahadevan K., Lee, Mark
Format: Article
Language:English
Subjects:
Broadband
Dielectric properties
Dielectrics
Dispersion
Dissipation factor
Frequency measurement
Integrated circuit (IC) packaging
Integrated circuit modeling
Integrated circuits
Liquid crystal polymers
Liquid crystals
Mechanical properties
Microwave circuits
Microwave frequencies
millimeter (mm)-wave
Millimeter waves
mm-wave ICs (MIMICs)
Packaging
Radio frequency
Semiconductor device measurement
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Summary:Liquid crystal polymers (LCPs) are a class of thermoplastic polymers widely used for packaging radio frequency (RF), microwave, and low millimeter (mm)-wave integrated circuits operating at frequencies as high as 77 GHz. Because of their relatively low cost and attractive electrical, thermal, and mechanical properties, LCPs are of potential interest as a packaging material for advanced circuits operating at high mm-wave frequencies, ~100-300 GHz. To potentially use LCPs at these frequencies will require a quantitative knowledge of the materials' dielectric properties across a broad frequency band. Here, we present nondestructive measurements of the dielectric constant, Dk , and dissipation factor, Df , on six commercially made LCP materials now used for packaging RF/microwave circuits. Measurements using phase-sensitive transmission from 140 to 220 GHz show values of Dk ranging between 2.0 and 4.5, with four materials essentially nondispersive but two showing significant dispersion in this band. Df values were in the range 0.01-0.06, substantially higher than that has been reported for many LCP materials at RF/microwave frequencies. The results are useful to model accurately the performance of packaged mm-wave circuits.
ISSN:2156-3950
2156-3985
DOI:10.1109/TCPMT.2021.3131921